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- A. Nallapa Reddy
- K. V. Bhaktavatsala
- D. S. N. Raju
- C. N. Ravindran
- R. Kalyansunder
- P. Ramesh
- K. S. Soodan
- P. Kumar
- Arun Kumar
- R. K. Saxena
- Alok Dave
- T. K. Chatterjee
- C. M. Mishra
- Jagmohan Singh
- K. Satyanarayana
- L. Chidambaram
- Shekhar Srivastava
- D. K. Bharktya
- R. Nagendra
- R. Kannan
- R. Bhavani
- P. Shanmuga Johari
- R. Raja
- B. C. JaiPrakash
- G. Nagendran
- K. Narasimha
- G. Keller
- P. K. Bhowmick
- H. Upadhyay
- A. Dave
- A. N. Reddy
- T. Adatte
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Jaiprakash, B. C.
- Sequence Biostratigraphy: A Case Study from the Godavari Shelf, India
Abstract Views :175 |
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Authors
Affiliations
1 Oil and Natural Gas Corporation Ltd., 3, First Lane, N.H. Road, Chennai - 600 034, IN
1 Oil and Natural Gas Corporation Ltd., 3, First Lane, N.H. Road, Chennai - 600 034, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 56, No 2 (2000), Pagination: 183-198Abstract
Quantitative foraminiferal data in a temporal succession identifies a type 1 third order Miocene depositional sequence (Ravva Formation/Sequence) of sechron ∼6 Ma in Godavari shelf area. This sequence has developed as a shelf delta build-up. This sequence is divided into a transgressive systems tract (TST) and a highstand systems tract (HST) separated by a maximum flooding surface (MFS), based on faunal frequency trends. The TST plays host to all reservoir facies, suggesting that the sand depocentres have migrated landward, concurrent with progress of the transgressive phase. The Ravva Sequence is bounded below by a type 1 unconformity spanning ∼7 Ma across the Oligocene-Miocene boundary. This unconformity surface hosts reservoir facies in well GS-AE-D. The sequence is bounded above by a type 1 unconformity of ∼10 Ma across the Miocene-Pliocene boundary. This unconformity is a diachronous surface produced by a progradational highstand systems tract. This surface represents possibly the only period during the Neogene, where large quantities of middle to late Miocene sediments may have by- passed the shelf. These by-passed sediments, according to the proposed sequence depositional model, should occur as Iowstand systems tract deposits (shelf edge deltas and fan deposits).Keywords
Sequence Stratigraphy, Sequence Boundary, Systems Tracts, Maximun Flooding Surface, Sechron, Miocene, Godavari Offshore.
- Orbulina universa d' Orbigny in Late Pleistocene Sediments of Northern Indian Ocean
Abstract Views :226 |
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Authors
Affiliations
1 Palaeontology Laboratory, KDM Institute of Petroleum Exploration, ONGC, Dehra Dun 248 195, IN
1 Palaeontology Laboratory, KDM Institute of Petroleum Exploration, ONGC, Dehra Dun 248 195, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 39, No 6 (1992), Pagination: 509-517Abstract
The genus Orbulina d' Orbigny 1839 in the Late Pleistocene sediments of the Northern Indian Ocean is represented by abundant population of O. universa d' Orbigny 1839 and rare O. bilobara d' Orbigny 1846. Temporal variation in the abundance and test size or O. universa has been analysed for their inter-relationship and paleoclimatological implications. The results suggest an inverse relationship between abundance and test growth which corroborates Allan Be's (1973) observations on Recent O. universa from Indian Ocean.Keywords
Palaeontology, Foraminifera, Pleistocene, Indian Ocean.- The Magnitude of Hiatus and Sea Level Changes Across KIT Boundary in Cauvery and Krishna-Godavari Basins, India
Abstract Views :192 |
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Authors
Affiliations
1 Palaeontology Lab., KDMIPE, ONGC, Dehra Dun-248195, IN
2 Regional Geology Lab., ONGC. No.3, First Lane, Nungambakkam High Road Madras 600034, IN
1 Palaeontology Lab., KDMIPE, ONGC, Dehra Dun-248195, IN
2 Regional Geology Lab., ONGC. No.3, First Lane, Nungambakkam High Road Madras 600034, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 44, No 3 (1994), Pagination: 301-315Abstract
A Major hiatus of varying time span ofiess than 1 Ma to greater than 30Ma encompasses the Cretaceous/Tertiary boundary (KTB) in several parts of the Cauvery, Krishna-Godavari (KG) and other pericratonic basins of India. The succession in the north and northeastern parts of Cauvery basin is apparently continuous, whereas in other areas of this basin, either the sediments of Late Maastrichtian or Middle-Late Maastrichtian or even Middle Campanian-Maastrichtian are unrepresented due to erosion/nondeposition. A north-northeasterly tilt within the Cauvery basin with some tectonic blocks subsiding is inferred during Late Maastrichtian. An additional event of global significance that occured across orvery close to the KTB in KG basin is volcanism within alimited duration of 3.8 to 5.5 Ma equivalent to Deccan volcanism. The succeeding transgression in Paleocene-Early Eocene was in pulses at levels ranging from Zone PI-P7. This hiatus appears to be linked with the rise of a giant hot mantle plume just prior to the eruption of Deccan volcanism during Abathompalus mayaroensis Zone of Latest Maastrichtian around 66.5Ma to 67.5Ma.Keywords
Stratigraphy, K/T Boundary, Cauvery Basin, Krishna-Godavari Basin.- Temporal Distribution of Benthic Foraminifera Across KTB in Krishna-Godavari Basin, India
Abstract Views :185 |
PDF Views:1
Authors
Affiliations
1 KDM Institute of Petroleum Exploration, ONGC, Dehra Dun-248195, IN
1 KDM Institute of Petroleum Exploration, ONGC, Dehra Dun-248195, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 44, No 3 (1994), Pagination: 317-325Abstract
The abundance, survivorship and extinctions of smaller benthic foraminifera across Cretaceous/ Tertiary Boundary in a well section GS-II-A in Krishna-Godavari basin appears to be a reflection of tolerance and responses to major geological events such as basinal rise, sea level drop, hiatus and widespread Deccan volcanism. During the terminal Cretaceous the marine environment possibly suffered declining CaCO3 level and anoxic conditions.
Towards the top of Cretaceous (Zones M -16/17), smaller calcareous benthic foraminifera show a decline in relative abundance of the order of 35 %. The relative abundance oflow O2 tolerant arenaceous foraminifera shows a gain of 20% to 25%. A hiatus of the order of less than 8.5Ma encompasses KTB. A major transgressive phase after an anoxic stage above KTB hiatus reestablishes equable conditions for the proliferation of smaller calcareous benthic foraminifera. This relative decline of calcareous benthic foraminifera and survival abilities of arenaceous benthic foramini fera is suggestive of gradual and possibly stepwise elimination process under ecological stress over a prolonged period caused by a chain of KTB events.
Keywords
Krishna-Godavari Basin, Cretaceous/Tertiary Boundary, Benthic Foraminifera, Micropalaeontology.- Late Eocene-Early Oligocene Biostratigraphy of Mansa-Indrora Area, Cambay Basin
Abstract Views :181 |
PDF Views:1
Authors
B. C. Jaiprakash
1,
P. Kumar
1
Affiliations
1 Palaeontology Laboratory, KDM Institute of Petroleum Exploration, ONGC, Dehra Dun 248 195, IN
1 Palaeontology Laboratory, KDM Institute of Petroleum Exploration, ONGC, Dehra Dun 248 195, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 42, No 4 (1993), Pagination: 357-367Abstract
Late Eocene-Early Oligocene succession from two well sections of north-eastern margin of Cambay Basin was analysed for their foraminifera1 content. It has yielded rich larger foraminifera a few planktonic and benthonic foraminifera. Three larger foraminiferal biozones have been recognised for the succession in geologically ascending order. These are Nummulites fabianii Partial Range Zone (? 39.4 m.y. to 37.4 m,y., i.e., ? P 15 to 16); Discocyclina dispansa - Nummulites fabianii Concurrent Range Zone (37.4 m.y. to 36 m.y.. i.e., Zone P 17) and Nummulites fichteli Partial Range Zone (36 m.y. to? 35 m.y., i.e., Zone P18), The environment of deposition has varied from shallow marine to inner and outer shelf conditions in the course of the development of the succession.Keywords
Foraminifera, Cambay Basin, Gujarat, Micropalaeontology, Stratigraphy.- On the Occurrence of Uvigerina danvillensis and Hantkenina trinidadensis from Cambay Basin
Abstract Views :194 |
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Authors
Affiliations
1 Palaeontology Laboratory, KDM Institute of Petroleum Exploration, ONGC, Dehra Dun 248 195, IN
1 Palaeontology Laboratory, KDM Institute of Petroleum Exploration, ONGC, Dehra Dun 248 195, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 42, No 4 (1993), Pagination: 368-372Abstract
Uvigerina danvillensis Howe and Wallace and Hantkenina trinididecrsis Bronnimann are described and illustrated from Late Eocene succession of Cambay basin. The presence of these two species at two levels indicates possible incursions of moderately deep marine conditions in an inner shelf set-up.Keywords
Foraminifera, Micropaleontology, Cambay Basin, Gujarat, Eocene.- Age of Deccan Volcanism Across KTB in Krishna-Godavari Basin: New Evidences
Abstract Views :183 |
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Authors
D. S. N. Raju
1,
B. C. Jaiprakash
1,
Arun Kumar
1,
R. K. Saxena
1,
Alok Dave
1,
T. K. Chatterjee
1,
C. M. Mishra
1
Affiliations
1 Geological Laboratories, KDM Institute of Petroleum Exploration, ONGC, Kaulagarh Road, Dehra Dun - 248195, IN
1 Geological Laboratories, KDM Institute of Petroleum Exploration, ONGC, Kaulagarh Road, Dehra Dun - 248195, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 45, No 2 (1995), Pagination: 229-233Abstract
The latest Paleontological data suggest that the duration of Deccan trap eruption in Krishna-Godavari basin varies from place to place and could be anywhere between <0.5 Ma and 6 Maacross KTB. Three groups of fossils viz., Planktic foraminifera, Nannoplanktics and Dinoflagellate cysts suggest that the initiation of volcanism was during latest Maastrichtian within the upper part of Abathomphalus mayaroensis Zone, Micula murus Zone and Triblastula utinensis Zone between 67 and 66.5 Ma. There are conflicting evidences in dating the upper age limit of the volcanics probably due to diverse methods employed in calibration of forarniniferal and nannoplanktic scales or selective retrieval of very small sized planktics of zones P0 and P1 in well cuttings.Keywords
Micropalaeotogy, Deccan Volcanism, Age, Krishna-Godawari Basin.- Foraminiferal Events Across K/T Boundary and Age of Deccan Volcanism in Palakollu Area, Krishna-Godavari Basin, India
Abstract Views :176 |
PDF Views:1
Authors
Affiliations
1 KDM Institute of Petroleum Exploration, Oil & Natural Gas Commission, Dehradun - 248 195, IN
1 KDM Institute of Petroleum Exploration, Oil & Natural Gas Commission, Dehradun - 248 195, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 41, No 2 (1993), Pagination: 105-117Abstract
Temporal distribution of planktonic and benthonic foraminifera across the K/T boundary in the Palakollu deep well section of Krishna-Godavari (KG) Basin, India, suggests that the lower Deccan trap flows have erupted during Zone M-18 of the latest Maastrichtian (66.5-65.5 m.y.) to Danian and the upper flows in lower Zone P2 of the Early Paleocene (6 1.2-60.7 m.y.). The span of volcanism will be approximately 6 m.y.Keywords
Cretaceous/Tertiary Boundary, Deccan Voicanism, Age, Krishna-Godavari Basin, Andra Pradesh.- A Note on Foraminifera, Grain Size and Clay Mineralogy of Tsunami Sediments from Karaikal-Nagore-Nagapattinam Beaches, Southeast Coast of India
Abstract Views :341 |
PDF Views:2
Authors
K. Satyanarayana
1,
A. Nallapa Reddy
1,
B. C. Jaiprakash
2,
L. Chidambaram
1,
Shekhar Srivastava
1,
D. K. Bharktya
1
Affiliations
1 Regional Laboratory, ONGC, Cauvery Basin, Chennai, IN
2 ONGC, Forward Base, Cauvery Basin, Karaikal, IN
1 Regional Laboratory, ONGC, Cauvery Basin, Chennai, IN
2 ONGC, Forward Base, Cauvery Basin, Karaikal, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 1 (2007), Pagination: 70-74Abstract
Analysis of tsunami sediments collected along Karaikal to Nagapattinam beaches revealed that all the sediments are of silty/Clay lithology consisting of predominantly montomorillonite, chlorite with rare presence of glauconite. Well preserved foraminiferal tests including long spines of Asterorotalia trispinosa and Ammonia dentata indicate no grain to grain abrasion during transportation of sediments. The fine grained lithology and foraminiferal assemblage data strongly point that there was only transfer of energy through tidal waves and there was no reworking of oceanic sediments.Keywords
Tsunami, Foraminifera, Clay Minerals, Beaches, Tamil Nadu Coast.- Pleistocene-Holocene Deep Water Benthic Foraminifera, off Tuticorin Coast, Bay of Bengal
Abstract Views :174 |
PDF Views:2
Authors
R. Nagendra
1,
R. Kannan
1,
R. Bhavani
1,
P. Shanmuga Johari
2,
A. Nallapa Reddy
3,
B. C. Jaiprakash
4
Affiliations
1 Center for Geoscience and Engineering, Anna University, Chennai - 600 025, IN
2 Department of Earth Sciences, University of Windsor, Windsor, Ontario, CA
3 Regional Geology Laboratory, Oil and Natural Gas Corporation Ltd , Chennai - 600 034, IN
4 Forward basin, ONGC, Tnpura Project, Badarghat Complex, Agarthala - 799 014, IN
1 Center for Geoscience and Engineering, Anna University, Chennai - 600 025, IN
2 Department of Earth Sciences, University of Windsor, Windsor, Ontario, CA
3 Regional Geology Laboratory, Oil and Natural Gas Corporation Ltd , Chennai - 600 034, IN
4 Forward basin, ONGC, Tnpura Project, Badarghat Complex, Agarthala - 799 014, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 63, No 1 (2004), Pagination: 51-60Abstract
Twenty-four Pleistocene-Holocene deepwater benthic foramimferal species were identified based upon taxonomic criteria from a 26 m core sample collected during Academik Aleksandr Sidorenko cruise. The quantitative data of benthic foraminifera) taxa is treated statistically using multi vanate (both factor and cluster) techniques to understand the relationship between species assemblages and environmental parameters. The temporal distribution of samples in cluster II closely coincides with the distribution of higher loading values of factor 1 Similar associations were identified for cluster III with factor 2 and cluster IV with factor 3. However the faunal relative abundances along with %. Total Organic Content (TOC) values broadly divides the core into two environmentally significant zones viz, Zone 1 (between 1322 6m and 1321 6 m) which is characterised by high abundance of Cassiduhna cannata followed by Pullenia bulloides and Hoeglundina elegans having positive relationship with low TOC values ranging from 0 12 to 1 14 and Zone 2 (between 1321 6m and 1320 1 m), which is characterised by high percentages of TOC values ranging from 1 32 to 2 52, whereas Buhmina aculeata shows maximum abundance followed by Bohvina robusta, Cibiadoides kullenbergi and Osangulana culter, suggesting that these species prefer high nutrient environment.Keywords
Benthic Foraminifera, Pleistocene, Holocene, Tuticonn, Bay of Bengal.- Outcrop Sequence Stratigraphy of the Maastrichtian Kallankurchchi formation, Ariyalur Group, Tamil Nadu
Abstract Views :184 |
PDF Views:2
Authors
Affiliations
1 Centre for Geoscience and Engineering, Anna University, Chennai - 600 025, IN
2 Regional Geology Laboratory, Oil & Natural Gas Corporation Ltd., Chennai - 600 034, IN
3 Geology Division, ONGC, Tripura Project, Badarghat complex, Agartala - 799 014, IN
1 Centre for Geoscience and Engineering, Anna University, Chennai - 600 025, IN
2 Regional Geology Laboratory, Oil & Natural Gas Corporation Ltd., Chennai - 600 034, IN
3 Geology Division, ONGC, Tripura Project, Badarghat complex, Agartala - 799 014, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 59, No 3 (2002), Pagination: 243-248Abstract
No Abstract.- Sequence Stratigraphy of Dalmiapuram formation, Kallakudi Quarry - II, South India
Abstract Views :226 |
PDF Views:2
Authors
Affiliations
1 Centre for Geosciencc and Engineering, Anna University, Chennai - 600 025, IN
2 Regional Geology Laboratory, Oil & Natural Gas Corporation Ltd., Chennai - 600 034, IN
3 Geology Division, ONGC, Tripura project, Badarghat complex, Agartala - 799 014, IN
1 Centre for Geosciencc and Engineering, Anna University, Chennai - 600 025, IN
2 Regional Geology Laboratory, Oil & Natural Gas Corporation Ltd., Chennai - 600 034, IN
3 Geology Division, ONGC, Tripura project, Badarghat complex, Agartala - 799 014, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 59, No 3 (2002), Pagination: 249-258Abstract
A sequence stratigraphic framework is worked out for the first time for the Dalmiapuram Formation exposed in Kallakudi quarry near Kallakudi village in Tiruchirapalli District. Thc complete lithological succession of this formation is designated as 'Dalmiapuram Sequence' of latest Albian - Cenomanian age and consists of grey shale, coral/algal limestone and bedded biostromal limestone and marl in ascending order. Grey shale rests unconformably ovcr thc Archaean basement. This contact forms the lower sequencc boundary of Dalmiapuram Sequence. The middle lithounit, the coral algal limestone rests ovcr grey shale. This unit abruptly grades into bedded limestone/marl alternations. This abrupt termination of coral algal limestone may be due to relative sea level rise and possibly this surface represents 'drowning unconformity'. The upper lithounit, which has alternating bands of biostromal limcstonc and marl, might indicatc cyclic carbonate precipitation (?Milankovich cycles). This unit is unconformably overlain by Neogene Cuddalore sandstone. This unconformity surface represents the upper boundary of the sequencc. The entire Dalmiapuram Sequence appears to have been deposited as Transgressive Systems Tract (TST) dcposit and got exposed as a result of basinal rise.Keywords
Sequence Stratigraphy, Dalmiapuram Sequence, Albian-Cenomanian, Kallakudi, Tamil Nadu.- Deccan Volcanism Linked to the Cretaceous-Tertiary Boundary Mass Extinction: New Evidence from ONGC Wells in the Krishna-Godavari Basin
Abstract Views :191 |
PDF Views:1
Authors
G. Keller
1,
P. K. Bhowmick
2,
H. Upadhyay
2,
A. Dave
2,
A. N. Reddy
3,
B. C. Jaiprakash
3,
T. Adatte
4
Affiliations
1 Geosciences Department, Princeton University, Princeton, NJ 08544, US
2 Keshava Dev Malaviya Institute of Petroleum Exploration, Oil and Natural Gas Corporation, Dehradun, IN
3 Oil and Natural Gas Corporation, Regional Geoscience Laboratory, Chennai, IN
4 Geological and Paleontological Institute, Anthropole, CH-1015 Lausanne, CH
1 Geosciences Department, Princeton University, Princeton, NJ 08544, US
2 Keshava Dev Malaviya Institute of Petroleum Exploration, Oil and Natural Gas Corporation, Dehradun, IN
3 Oil and Natural Gas Corporation, Regional Geoscience Laboratory, Chennai, IN
4 Geological and Paleontological Institute, Anthropole, CH-1015 Lausanne, CH
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 5 (2011), Pagination: 399-428Abstract
A scientific challenge is to assess the role of Deccan volcanism in the Cretaceous-Tertiary boundary (KTB) mass extinction. Here we report on the stratigraphy and biologic effects of Deccan volcanism in eleven deep wells from the Krishna-Godavari (K-G) Basin, Andhra Pradesh, India. In these wells, two phases of Deccan volcanism record the world's largest and longest lava mega-flows interbedded in marine sediments in the K-G Basin about 1500 km from the main Deccan volcanic province. The main phase-2 eruptions (∼80% of total Deccan Traps) began in C29r and ended at or near the KTB, an interval that spans planktic foraminiferal zones CF1-CF2 and most of the nannofossil Micula prinsii zone, and is correlative with the rapid global warming and subsequent cooling near the end of the Maastrichtian. The mass extinction began in phase-2 preceding the first of four mega-flows. Planktic foraminifera suffered a 50% drop in species richness. Survivors suffered another 50% drop after the first mega-flow, leaving just 7 to 8 survivor species. No recovery occurred between the next three mega-flows and the mass extinction was complete with the last phase-2 megaflow at the KTB. The mass extinction was likely the consequence of rapid and massive volcanic CO2 and SO2 gas emissions, leading to high continental weathering rates, global warming, cooling, acid rains, ocean acidification and a carbon crisis in the marine environment.
Deccan volcanism phase-3 began in the early Danian near the C29R/C29n boundary correlative with the planktic foraminiferal zone P1a/P1b boundary and accounts for ∼14% of the total volume of Deccan eruptions, including four of Earth's longest and largest mega-flows. No major faunal changes are observed in the intertrappeans of zone P1b, which suggests that environmental conditions remained tolerable, volcanic eruptions were less intense and/or separated by longer time intervals thus preventing runaway effects. Alternatively, early Danian assemblages evolved in adaptation to high-stress conditions in the aftermath of the mass extinction and therefore survived phase-3 volcanism. Full marine biotic recovery did not occur until after Deccan phase-3. These data suggest that the catastrophic effects of phase-2 Deccan volcanism upon the Cretaceous planktic foraminifera were a function of both the rapid and massive volcanic eruptions and the highly specialized faunal assemblages prone to extinction in a changing environment. Data from the K-G Basin indicates that Deccan phase-2 alone could have caused the KTB mass extinction and that impacts may have had secondary effects.
Keywords
Cretaceous-Tertiary, Mass Extinction, Deccan Volcanism, Longest Lava Flows, Krishna-Godavari Basin.References
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